The pregap4 Options menu contains options for modifying the fonts and colours
used. These options are common to many programs and so are documented
elsewhere.See section Font Selection.See section Colour Selector.

Pregap4 supports two styles of windowing. The default method is a compact
mode, with the alternative being "separate" mode - similar to gap4 and
spin.

This is the "separate" window style. Here the main window is always visible,
with commands in the main window bringing up new windows. In the picture above
the configure window can be seen on top of the main window.

The second style is "compact" mode.

In the compact picture above the most common top level windows are "pages" in
a tabbed notebook.
This is similar to some window styles in the Microsoft
Windows desktop.
The benefit is greatly reduced screen space and quicker
controls, but the text output window is no longer permanently visible.